Under the UN/DOT Marking System, Hazard Class 3 corresponds to which example of material?

Under the UN/DOT Marking System, Hazard Class 3 corresponds to which example of material?

• A. Water
• B. Diesel
• C. Gasoline
• D. Mercury

Answer: (C)

Hazard Class 3 tests your understanding of flammable liquids—liquids that have a flash point below 60°C. Gasoline is a quintessential example because its vapors ignite very easily at normal temperatures, which is exactly what the class is about. That low flash point makes gasoline a textbook illustration of a Class 3 material under the UN/DOT marking system. Water isn’t flammable, and mercury is a metal, not a flammable liquid, so they don’t fit Class 3. Diesel is also a flammable liquid and would be Class 3 as well, but gasoline is the clearest, most widely used example to represent this category.

Hazard Class 3 tests your understanding of flammable liquids—liquids that have a flash point below 60°C. Gasoline is a quintessential example because its vapors ignite very easily at normal temperatures, which is exactly what the class is about. That low flash point makes gasoline a textbook illustration of a Class 3 material under the UN/DOT marking system.

Water isn’t flammable, and mercury is a metal, not a flammable liquid, so they don’t fit Class 3. Diesel is also a flammable liquid and would be Class 3 as well, but gasoline is the clearest, most widely used example to represent this category.